Compose Your Message

Locking of two tubes is an easy engineering problem to solve.
I have a set of small hole diameter measuring devices by Moore and Wright they
use the pinciple which is, I am sure, likeley to be used in the German
version; or will serve well anyway.
Consider a threaded rod in a tube with a wheel on the threaded portion at one
end such that turning the wheel pulls the threaded rod in the tube. At the
other end of the tube you have two holes in the side of the tube with two
hardened balls (for Ball bearings)inside the tube but poking out partially.
The threaded rod is made into an inverted conical taper where the balls are,
thus when the rod is pulled down the tube the balls are pushed outwards.
This principle is how the inner tube of a Bygrave device can be locked. The
tapered rod can push two rods or balls or any shaped form of side pieces
outwards against the inner tube, thus slightly bending it into an elipse
which will bind with the outer tube in which it rotates/slides and hence
locking it.
Douglas Denny.
Chichester. England.
--------------------------------------------------------
[Sent from archive by: douglas.denny-AT-btopenworld.com]
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To unsubscribe, email NavList-unsubscribe@fer3.com
-~----------~----~----~----~------~----~------~--~---